Banca de QUALIFICAÇÃO: FABIO VINICIUS MARLEY SANTOS LIMA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : FABIO VINICIUS MARLEY SANTOS LIMA
DATE: 25/10/2024
TIME: 10:00
LOCAL: Remoto - Google Meet
TITLE:

Multi-Sensor Geodetic Observations as a Tool for Monitoring and Classifying Extreme Climate Events

KEY WORDS:

remote sensing, hydrometeorological monitoring, geodeic technology, GRACE, drought 

PAGES: 57
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUBÁREA: Meteorologia
SPECIALTY: Climatologia
SUMMARY:

The hydrological cycle presents natural spatial and temporal variations that, intensified by climate change, increase the frequency of extreme events such as droughts and floods, with serious socio-economic and environmental impacts. Geodetic sensing, through data from missions such as GRACE, GRACE-FO, and GNSS systems, has proven fundamental for monitoring these hydrological mass variations and associated extreme events, aiding in the understanding and management of these phenomena. In Brazil, a country with great climate diversity and challenges in water management, it is essential to develop new tools and policies that integrate the interactions between climate, land use, and hydrology, aiming at the sustainability of water resources and the mitigation of the impacts of extreme events. The thesis explores the use of geodetic observations and remote sensing techniques to monitor and characterize extreme events, such as droughts and floods, in Brazil, providing new insights into hydrological behavior and the response of the Earth's surface. Using data from the GRACE and GNSS missions, the study applies various methodologies to evaluate the effectiveness of geodetic indices in monitoring hydrological droughts and quantifying the volumes of water bodies under extreme climate conditions. The chapters of this thesis address the spatio-temporal characterization of the drought in the Sao Francisco River Basin (RHSF) using various indices, such as the Combined Climatic Deviation Index (CCDI), Drought Severity Index (DSI), Vertical Crustal Deformation Index (DIVCD), and Standardized Precipitation Index (SPI) on 3, 12, 24, and 36-month scales. The correlations found show that the CCDI is effective in characterizing meteorological droughts, presenting a stronger correlation with SPI-03 (ρ = 0.59). On the other hand, the DSI demonstrated greater applicability for the characterization of hydrological droughts in the region, correlating better with SPI-36 (ρ = 0.59). The use of GNSS observations to monitor droughts in artificial reservoirs, such as Sobradinho and Itaparica in the RHSF, was analyzed through the DIVCD, and the index showed good correlation with the Standardized Precipitation and Evapotranspiration Index (SPEI) on 12, 24, 36, and 48-month scales, with the best results at 36 months for the Itaparica reservoir (ρ = 0.57) and 48 months for the Sobradinho reservoir (ρ = 0.60). These results corroborate the applicability of the DIVCD in hydrological drought studies. By integrating different methodologies and data sets, the research contributes to improving water resource management and mitigating the impacts of extreme climate events, highlighting the importance of geodetic sensing as a tool to address the challenges of climate change and hydrometeorological variability in Brazil.

COMMITTEE MEMBERS:
Interno - 2086472 - BERGSON GUEDES BEZERRA
Externo à Instituição - HENRY MONTECINO CASTRO - UdeC
Interno - 2411669 - JONATHAN MOTA DA SILVA
Presidente - 3217859 - PEDRO RODRIGUES MUTTI
Externo à Instituição - RODRIGO MIKOSZ GONÇALVES - UFPE